implement wallet password change.

implement wallet delete (though actual wallet file delete is left out still)

electrum/gui/qml/components/WalletMainView.qml

@@ -6,7 +6,7 @@ import QtQml 2.6
 Item {
     id: rootItem
 
-    property string title: Daemon.currentWallet.name
+    property string title: Daemon.currentWallet ? Daemon.currentWallet.name : ''
 
     property QtObject menu: Menu {
         id: menu

electrum/gui/qml/components/Wallets.qml

@@ -41,7 +41,8 @@ Pane {
     }
 
     function changePassword() {
-        // TODO: show set password dialog
+        // trigger dialog via wallet (auth then signal)
+        Daemon.currentWallet.start_change_password()
     }
 
     property QtObject menu: Menu {
@@ -58,7 +59,7 @@ Pane {
             id: changePasswordComp
             MenuItem {
                 icon.color: 'transparent'
-                enabled: false
+                enabled: Daemon.currentWallet // != null
                 action: Action {
                     text: qsTr('Change Password');
                     onTriggered: rootItem.changePassword()
@@ -308,6 +309,23 @@ Pane {
         }
     }
 
+    Connections {
+        target: Daemon.currentWallet
+        function onRequestNewPassword() { // new wallet password
+            var dialog = app.passwordDialog.createObject(app,
+                    {
+                        'confirmPassword': true,
+                        'title': qsTr('Enter new password'),
+                        'infotext': qsTr('If you forget your password, you\'ll need to\
+                        restore from seed. Please make sure you have your seed stored safely')
+                    } )
+            dialog.accepted.connect(function() {
+                Daemon.currentWallet.set_password(dialog.password)
+            })
+            dialog.open()
+        }
+    }
+
     Component {
         id: share
         GenericShareDialog {

electrum/gui/qml/components/controls/PasswordDialog.qml

@@ -0,0 +1,115 @@
+import QtQuick 2.6
+import QtQuick.Layouts 1.0
+import QtQuick.Controls 2.3
+import QtQuick.Controls.Material 2.0
+
+import org.electrum 1.0
+
+Dialog {
+    id: passworddialog
+
+    title: qsTr("Enter Password")
+
+    property bool confirmPassword: false
+    property string password
+    property string infotext
+
+    parent: Overlay.overlay
+    modal: true
+    x: (parent.width - width) / 2
+    y: (parent.height - height) / 2
+    Overlay.modal: Rectangle {
+        color: "#aa000000"
+    }
+
+    header: GridLayout {
+        columns: 2
+        rowSpacing: 0
+
+        Image {
+            source: "../../../icons/lock.png"
+            Layout.preferredWidth: constants.iconSizeXLarge
+            Layout.preferredHeight: constants.iconSizeXLarge
+            Layout.leftMargin: constants.paddingMedium
+            Layout.topMargin: constants.paddingMedium
+            Layout.bottomMargin: constants.paddingMedium
+        }
+
+        Label {
+            text: title
+            elide: Label.ElideRight
+            Layout.fillWidth: true
+            topPadding: constants.paddingXLarge
+            bottomPadding: constants.paddingXLarge
+            font.bold: true
+            font.pixelSize: constants.fontSizeMedium
+        }
+
+        Rectangle {
+            Layout.columnSpan: 2
+            Layout.fillWidth: true
+            Layout.leftMargin: constants.paddingXXSmall
+            Layout.rightMargin: constants.paddingXXSmall
+            height: 1
+            color: Qt.rgba(0,0,0,0.5)
+        }
+    }
+
+    ColumnLayout {
+        width: parent.width
+
+        InfoTextArea {
+            visible: infotext
+            text: infotext
+            Layout.preferredWidth: password_layout.width
+        }
+
+        GridLayout {
+            id: password_layout
+            columns: 2
+            Layout.fillWidth: true
+            Layout.margins: constants.paddingXXLarge
+
+            Label {
+                text: qsTr('Password')
+            }
+
+            TextField {
+                id: pw_1
+                echoMode: TextInput.Password
+            }
+
+            Label {
+                text: qsTr('Password (again)')
+                visible: confirmPassword
+            }
+
+            TextField {
+                id: pw_2
+                echoMode: TextInput.Password
+                visible: confirmPassword
+            }
+        }
+
+        RowLayout {
+            Layout.alignment: Qt.AlignHCenter
+            Layout.topMargin: constants.paddingXXLarge
+
+            Button {
+                text: qsTr("Ok")
+                enabled: confirmPassword ? pw_1.text == pw_2.text : true
+                onClicked: {
+                    password = pw_1.text
+                    passworddialog.accept()
+                }
+            }
+            Button {
+                text: qsTr("Cancel")
+                onClicked: {
+                    passworddialog.reject()
+                }
+            }
+        }
+    }
+
+}

electrum/gui/qml/components/main.qml

@@ -171,6 +171,14 @@ ApplicationWindow
         }
     }
 
+    property alias passwordDialog: _passwordDialog
+    Component {
+        id: _passwordDialog
+        PasswordDialog {
+            onClosed: destroy()
+        }
+    }
+
     NotificationPopup {
         id: notificationPopup
     }
@@ -225,16 +233,25 @@ ApplicationWindow
     Connections {
         target: Daemon.currentWallet
         function onAuthRequired() {
-            var dialog = app.messageDialog.createObject(app, {'text': 'Auth placeholder', 'yesno': true})
-            dialog.yesClicked.connect(function() {
+            if (Daemon.currentWallet.verify_password('')) {
+                // wallet has no password
                 Daemon.currentWallet.authProceed()
+            } else {
+                var dialog = app.passwordDialog.createObject(app, {'title': qsTr('Enter current password')})
+                dialog.accepted.connect(function() {
+                    if (Daemon.currentWallet.verify_password(dialog.password)) {
+                        Daemon.currentWallet.authProceed()
+                    } else {
+                        Daemon.currentWallet.authCancel()
+                    }
                 })
-            dialog.noClicked.connect(function() {
+                dialog.rejected.connect(function() {
                     Daemon.currentWallet.authCancel()
                 })
                 dialog.open()
             }
         }
+    }
 
     Connections {
         target: Daemon

electrum/gui/qml/qeapp.py

@@ -52,6 +52,8 @@ class QEAppController(QObject):
 
     def on_wallet_loaded(self):
         qewallet = self._qedaemon.currentWallet
+        if not qewallet:
+            return
         # attach to the wallet user notification events
         # connect only once
         try:

electrum/gui/qml/qedaemon.py

@@ -152,7 +152,12 @@ class QEDaemon(AuthMixin, QObject):
         path = wallet.wallet.storage.path
         self._logger.debug('Ok to delete wallet with path %s' % path)
         # TODO checks, e.g. existing LN channels, unpaid requests, etc
+        self._logger.debug('Not deleting yet, just unloading for now')
+        # TODO actually delete
+        # TODO walletLoaded signal is confusing
         self.daemon.stop_wallet(path)
+        self._current_wallet = None
+        self.walletLoaded.emit()
 
     @pyqtProperty('QString')
     def path(self):

electrum/gui/qml/qewallet.py

@@ -7,9 +7,10 @@ import threading
 from PyQt5.QtCore import pyqtProperty, pyqtSignal, pyqtSlot, QObject, QUrl, QTimer
 
 from electrum.i18n import _
-from electrum.util import register_callback, Satoshis, format_time, parse_max_spend
+from electrum.util import register_callback, Satoshis, format_time, parse_max_spend, InvalidPassword
 from electrum.logging import get_logger
 from electrum.wallet import Wallet, Abstract_Wallet
+from electrum.storage import StorageEncryptionVersion
 from electrum import bitcoin
 from electrum.transaction import PartialTxOutput
 from electrum.invoices import   (Invoice, InvoiceError,
@@ -331,7 +332,7 @@ class QEWallet(AuthMixin, QObject):
         self.wallet.init_lightning(password=None) # TODO pass password if needed
         self.isLightningChanged.emit()
 
-    @pyqtSlot('QString', int, int, bool)
+    @pyqtSlot(str, int, int, bool)
     def send_onchain(self, address, amount, fee=None, rbf=False):
         self._logger.info('send_onchain: %s %d' % (address,amount))
         coins = self.wallet.get_spendable_coins(None)
@@ -437,9 +438,9 @@ class QEWallet(AuthMixin, QObject):
 
         return req_key, addr
 
-    @pyqtSlot(QEAmount, 'QString', int)
-    @pyqtSlot(QEAmount, 'QString', int, bool)
-    @pyqtSlot(QEAmount, 'QString', int, bool, bool)
+    @pyqtSlot(QEAmount, str, int)
+    @pyqtSlot(QEAmount, str, int, bool)
+    @pyqtSlot(QEAmount, str, int, bool, bool)
     def create_request(self, amount: QEAmount, message: str, expiration: int, is_lightning: bool = False, ignore_gap: bool = False):
         try:
             if is_lightning:
@@ -463,29 +464,52 @@ class QEWallet(AuthMixin, QObject):
         self._requestModel.add_invoice(self.wallet.get_request(key))
         self.requestCreateSuccess.emit()
 
-    @pyqtSlot('QString')
+    @pyqtSlot(str)
     def delete_request(self, key: str):
         self._logger.debug('delete req %s' % key)
         self.wallet.delete_request(key)
         self._requestModel.delete_invoice(key)
 
-    @pyqtSlot('QString', result='QVariant')
+    @pyqtSlot(str, result='QVariant')
     def get_request(self, key: str):
         return self._requestModel.get_model_invoice(key)
 
-    @pyqtSlot('QString')
+    @pyqtSlot(str)
     def delete_invoice(self, key: str):
         self._logger.debug('delete inv %s' % key)
         self.wallet.delete_invoice(key)
         self._invoiceModel.delete_invoice(key)
 
-    @pyqtSlot('QString', result='QVariant')
+    @pyqtSlot(str, result='QVariant')
     def get_invoice(self, key: str):
         return self._invoiceModel.get_model_invoice(key)
 
-    @pyqtSlot(str)
+    @pyqtSlot(str, result=bool)
+    def verify_password(self, password):
+        try:
+            self.wallet.storage.check_password(password)
+            return True
+        except InvalidPassword as e:
+            return False
+
+    requestNewPassword = pyqtSignal()
+    @pyqtSlot()
     @auth_protect
+    def start_change_password(self):
+        self.requestNewPassword.emit()
+
+    @pyqtSlot(str)
     def set_password(self, password):
         storage = self.wallet.storage
+
+        # HW wallet not supported yet
+        if storage.is_encrypted_with_hw_device():
+            return
+
         self._logger.debug('Ok to set password for wallet with path %s' % storage.path)
-        # TODO
+        if password:
+            enc_version = StorageEncryptionVersion.USER_PASSWORD
+        else:
+            enc_version = StorageEncryptionVersion.PLAINTEXT
+        storage.set_password(password, enc_version=enc_version)
+        self.wallet.save_db()